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Property and Equipment (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Amount of property and equipment    
Property and Equipment gross $ 233,567 $ 180,504
Accumulated depreciation and amortization 80,554 67,979
Property and Equipment net 153,013 112,525
Land
   
Amount of property and equipment    
Property and Equipment gross 4,653 4,653
Buildings and Leasehold improvements
   
Amount of property and equipment    
Property and Equipment gross 47,731 21,081
Office equipment, furniture and fixtures
   
Amount of property and equipment    
Property and Equipment gross 12,878 8,415
Computer equipment and software costs
   
Amount of property and equipment    
Property and Equipment gross 84,665 80,233
Machinery, equipment and vehicles
   
Amount of property and equipment    
Property and Equipment gross $ 83,640 $ 66,122